mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-23 21:25:49 +00:00
209 lines
7.6 KiB
C++
209 lines
7.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_RANDOM_SHUFFLE_ORDER_HPP
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#define SPROUT_RANDOM_SHUFFLE_ORDER_HPP
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#include <cstddef>
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#include <cstdint>
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#include <ios>
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#include <istream>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/array/array.hpp>
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#include <sprout/operation/fixed/set.hpp>
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#include <sprout/math/compare.hpp>
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#include <sprout/random/random_result.hpp>
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#include <sprout/random/linear_congruential.hpp>
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#include <sprout/random/detail/signed_unsigned_tools.hpp>
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#include <sprout/assert.hpp>
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namespace sprout {
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namespace random {
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namespace detail {
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template<typename UniformRandomNumberGenerator, std::size_t k>
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class shuffle_order_engine_member {
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protected:
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typedef UniformRandomNumberGenerator base_type;
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typedef typename base_type::result_type result_type;
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public:
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base_type rng_;
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sprout::array<result_type, k> v_;
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result_type y_;
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};
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} // namespace detail
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//
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// shuffle_order_engine
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//
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template<typename UniformRandomNumberGenerator, std::size_t k>
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class shuffle_order_engine
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: private sprout::random::detail::shuffle_order_engine_member<UniformRandomNumberGenerator, k>
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{
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static_assert(
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sprout::numeric_limits<typename UniformRandomNumberGenerator::result_type>::is_integer,
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"sprout::numeric_limits<typename UniformRandomNumberGenerator::result_type>::is_integer"
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);
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static_assert(k > 0, "k > 0");
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private:
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typedef sprout::random::detail::shuffle_order_engine_member<UniformRandomNumberGenerator, k> member_type;
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public:
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typedef UniformRandomNumberGenerator base_type;
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typedef typename base_type::result_type result_type;
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private:
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struct private_constructor_tag {};
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public:
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SPROUT_STATIC_CONSTEXPR std::size_t buffer_size = k;
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SPROUT_STATIC_CONSTEXPR std::size_t table_size = k;
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public:
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static SPROUT_CONSTEXPR result_type static_min() SPROUT_NOEXCEPT {
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return base_type::static_min();
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}
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static SPROUT_CONSTEXPR result_type static_max() SPROUT_NOEXCEPT {
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return base_type::static_max();
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}
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private:
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template<typename Random, typename... Args>
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static SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) == k,
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member_type
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>::type init_member_1(Random const& rnd, Args const&... args) {
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return member_type{
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rnd.engine(),
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sprout::array<result_type, k>{{args...}},
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rnd.result()
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};
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}
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template<typename Random, typename... Args>
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static SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) < k,
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member_type
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>::type init_member_1(Random const& rnd, Args const&... args) {
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return init_member_1(rnd(), args..., rnd.result());
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}
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static SPROUT_CONSTEXPR member_type init_member(base_type const& rng) {
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return init_member_1(rng());
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}
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private:
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using member_type::rng_;
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using member_type::v_;
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using member_type::y_;
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private:
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SPROUT_CONSTEXPR shuffle_order_engine(
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base_type const& rng,
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sprout::array<result_type, k> const& v,
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result_type const& y,
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private_constructor_tag
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)
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: member_type{rng, v, y}
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{}
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template<typename Random, typename BaseUnsigned>
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SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine>
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generate_1(Random const& rnd, BaseUnsigned j) const {
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return sprout::random::random_result<shuffle_order_engine>(
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v_[j],
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shuffle_order_engine(
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rnd.engine(),
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sprout::fixed::set(v_, j, rnd.result()),
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v_[j],
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private_constructor_tag()
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)
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);
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}
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template<typename BaseUnsigned>
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SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine>
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generate(BaseUnsigned brange, BaseUnsigned off) const {
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return generate_1(
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rng_(),
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k == 1 ? BaseUnsigned(0)
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: sprout::math::less(brange, sprout::numeric_limits<BaseUnsigned>::max() / k) ? BaseUnsigned(k * off / (brange + 1))
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: sprout::math::less(brange, sprout::numeric_limits<std::uintmax_t>::max() / k)
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? static_cast<BaseUnsigned>(static_cast<std::uintmax_t>(off) * k / (static_cast<std::uintmax_t>(brange) + 1))
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//: static_cast<BaseUnsigned>(sprout::random::detail::muldiv(off, k, static_cast<std::uintmax_t>(brange) + 1)) // ???
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: (SPROUT_ASSERT_MSG(0, "Sorry, not implemented."), sprout::random::random_result<shuffle_order_engine>())
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);
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}
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public:
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SPROUT_CONSTEXPR shuffle_order_engine()
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: member_type(init_member(base_type()))
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{}
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explicit SPROUT_CONSTEXPR shuffle_order_engine(result_type const& s)
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: member_type(init_member(base_type(s)))
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{}
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explicit SPROUT_CONSTEXPR shuffle_order_engine(base_type const& rng)
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: member_type(init_member(rng))
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{}
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SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
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return rng_.min();
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}
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SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
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return rng_.max();
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}
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SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine> operator()() const {
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typedef typename std::make_unsigned<result_type>::type base_unsigned;
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return generate(
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base_unsigned(sprout::random::detail::subtract<result_type>()(max(), min())),
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base_unsigned(sprout::random::detail::subtract<result_type>()(y_, min()))
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);
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}
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SPROUT_CONSTEXPR base_type const& base() const SPROUT_NOEXCEPT {
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return rng_;
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}
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friend SPROUT_CONSTEXPR bool operator==(shuffle_order_engine const& lhs, shuffle_order_engine const& rhs) SPROUT_NOEXCEPT {
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return lhs.rng_ == rhs.rng_ && lhs.y_ == rhs.y_ && lhs.v_ == rhs.v_;
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}
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friend SPROUT_CONSTEXPR bool operator!=(shuffle_order_engine const& lhs, shuffle_order_engine const& rhs) SPROUT_NOEXCEPT {
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return !(lhs == rhs);
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}
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template<typename Elem, typename Traits>
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friend std::basic_istream<Elem, Traits>& operator>>(
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std::basic_istream<Elem, Traits>& lhs,
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shuffle_order_engine& rhs
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)
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{
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lhs >> rhs.rng_;
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for (std::size_t i = 0; i < k; ++i) {
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lhs >> std::ws >> rhs.v_[i];
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}
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lhs >> std::ws >> rhs.y_;
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return lhs;
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}
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template<typename Elem, typename Traits>
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friend std::basic_ostream<Elem, Traits>& operator<<(
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std::basic_ostream<Elem, Traits>& lhs,
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shuffle_order_engine const& rhs
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)
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{
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lhs << rhs.rng_;
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for (std::size_t i = 0; i < k; ++i) {
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lhs << ' ' << rhs.v_[i];
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}
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lhs << ' ' << rhs.y_;
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return lhs;
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}
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};
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template<typename UniformRandomNumberGenerator, std::size_t k>
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SPROUT_CONSTEXPR_OR_CONST std::size_t sprout::random::shuffle_order_engine<UniformRandomNumberGenerator, k>::buffer_size;
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template<typename UniformRandomNumberGenerator, std::size_t k>
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SPROUT_CONSTEXPR_OR_CONST std::size_t sprout::random::shuffle_order_engine<UniformRandomNumberGenerator, k>::table_size;
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//
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// knuth_b
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//
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typedef sprout::random::shuffle_order_engine<sprout::random::minstd_rand0, 256> knuth_b;
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//
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// kreutzer1986
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//
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typedef sprout::random::shuffle_order_engine<sprout::random::linear_congruential_engine<std::uint32_t, 1366, 150889, 714025>, 97> kreutzer1986;
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} // namespace random
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using sprout::random::shuffle_order_engine;
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using sprout::random::knuth_b;
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using sprout::random::kreutzer1986;
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_SHUFFLE_ORDER_HPP
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